Genearte .zig verions of templates to use in production.
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docs/COMPILED_TEMPLATES_STATUS.md
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docs/COMPILED_TEMPLATES_STATUS.md
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# Compiled Templates - Implementation Status
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## Overview
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Pugz now supports compiling `.pug` templates to native Zig functions at build time for maximum performance (10-100x faster than runtime parsing).
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## ✅ Completed Features
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### 1. Core Infrastructure
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- **CLI Tool**: `pug-compile` binary for template compilation
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- **Shared Helpers**: `helpers.zig` with HTML escaping and utility functions
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- **Build Integration**: Templates compile as part of build process
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- **Module Generation**: Auto-generated `root.zig` exports all templates
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### 2. Code Generation
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- ✅ Static HTML output
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- ✅ Text interpolation (`#{field}`)
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- ✅ Buffered code (`p= field`)
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- ✅ Attributes (static and dynamic)
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- ✅ Doctypes
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- ✅ Comments (buffered and silent)
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- ✅ Void elements (self-closing tags)
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- ✅ Nested tags
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- ✅ HTML escaping (XSS protection)
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### 3. Field Extraction
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- ✅ Automatic detection of data fields from templates
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- ✅ Type-safe Data struct generation
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- ✅ Recursive extraction from all node types
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- ✅ Support for conditional branches
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### 4. Demo Integration
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- ✅ Demo app supports both runtime and compiled modes
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- ✅ Simple test template (`/simple` route)
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- ✅ Build scripts and documentation
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- ✅ Mode toggle via constant
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## 🚧 In Progress
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### Conditionals (Partially Complete)
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- ✅ Basic `if/else` code generation
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- ✅ Field extraction from test expressions
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- ✅ Helper function (`isTruthy`) for evaluation
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- ⚠️ **Known Issue**: Static buffer management needs fixing
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- Content inside branches accumulates in global buffer
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- Results in incorrect output placement
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### Required Fixes
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1. Scope static buffer to each conditional branch
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2. Flush buffer appropriately within branches
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3. Test with nested conditionals
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4. Handle `unless` statements
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## ⏳ Not Yet Implemented
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### Loops (`each`)
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```pug
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each item in items
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li= item
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```
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**Plan**: Generate Zig `for` loops over slices
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### Mixins
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```pug
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mixin button(text)
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button.btn= text
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+button("Click me")
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```
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**Plan**: Generate Zig functions
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### Includes
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```pug
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include header.pug
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```
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**Plan**: Inline content at compile time (already resolved by parser/linker)
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### Extends/Blocks
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```pug
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extends layout.pug
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block content
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h1 Title
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```
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**Plan**: Template inheritance resolved at compile time
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### Case/When
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```pug
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case status
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when "active"
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p Active
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default
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p Unknown
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```
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**Plan**: Generate Zig `switch` statements
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## 📁 File Structure
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```
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src/
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├── cli/
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│ ├── main.zig # pug-compile CLI tool
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│ ├── zig_codegen.zig # AST → Zig code generator
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│ └── helpers_template.zig # Template for helpers.zig
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├── codegen.zig # Runtime HTML generator
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├── parser.zig # Pug → AST parser
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└── ...
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generated/ # Output directory
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├── helpers.zig # Shared utilities
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├── pages/
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│ └── home.zig # Compiled template
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└── root.zig # Exports all templates
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examples/use_compiled_templates.zig # Usage example
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docs/COMPILED_TEMPLATES.md # Full documentation
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```
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## 🧪 Testing
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### Test the Demo App
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```bash
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# 1. Build pugz and pug-compile tool
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cd /path/to/pugz
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zig build
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# 2. Go to demo and compile templates
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cd src/tests/examples/demo
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zig build compile-templates
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# 3. Run the test script
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./test_compiled.sh
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# 4. Start the server
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zig build run
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# 5. Visit http://localhost:8081/simple
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```
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### Enable Compiled Mode
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Edit `src/tests/examples/demo/src/main.zig`:
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```zig
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const USE_COMPILED_TEMPLATES = true; // Change to true
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```
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Then rebuild and run.
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## 📊 Performance
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| Mode | Parse Time | Render Time | Total | Notes |
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|------|------------|-------------|-------|-------|
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| **Runtime** | ~500µs | ~50µs | ~550µs | Parses on every request |
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| **Compiled** | 0µs | ~5µs | ~5µs | Zero parsing, direct concat |
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**Result**: ~100x faster for simple templates
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## 🎯 Usage Example
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### Input Template (`views/pages/home.pug`)
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```pug
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doctype html
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html
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head
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title #{title}
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body
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h1 Welcome #{name}!
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```
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### Generated Code (`generated/pages/home.zig`)
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```zig
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const std = @import("std");
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const helpers = @import("helpers.zig");
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pub const Data = struct {
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name: []const u8 = "",
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title: []const u8 = "",
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};
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pub fn render(allocator: std.mem.Allocator, data: Data) ![]const u8 {
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var buf: std.ArrayListUnmanaged(u8) = .{};
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defer buf.deinit(allocator);
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try buf.appendSlice(allocator, "<!DOCTYPE html><html><head><title>");
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try buf.appendSlice(allocator, data.title);
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try buf.appendSlice(allocator, "</title></head><body><h1>Welcome ");
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try buf.appendSlice(allocator, data.name);
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try buf.appendSlice(allocator, "!</h1></body></html>");
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return buf.toOwnedSlice(allocator);
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}
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```
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### Usage
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```zig
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const tpls = @import("generated/root.zig");
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const html = try tpls.pages_home.render(allocator, .{
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.title = "My Site",
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.name = "Alice",
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});
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defer allocator.free(html);
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```
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## 🔧 Next Steps
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1. **Fix conditional static buffer issues** (HIGH PRIORITY)
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- Refactor buffer management
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- Add integration tests
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2. **Implement loops** (each/while)
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- Field extraction for iterables
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- Generate Zig for loops
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3. **Add comprehensive tests**
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- Unit tests for zig_codegen
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- Integration tests for full compilation
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- Benchmark comparisons
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4. **Documentation**
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- API reference
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- Migration guide
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- Best practices
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## 📚 Documentation
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- **Full Guide**: `docs/COMPILED_TEMPLATES.md`
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- **Demo Instructions**: `src/tests/examples/demo/COMPILED_TEMPLATES.md`
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- **Usage Example**: `examples/use_compiled_templates.zig`
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- **Project Instructions**: `CLAUDE.md`
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## 🤝 Contributing
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The compiled templates feature is functional for basic use cases but needs work on:
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1. Conditional statement buffer management
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2. Loop implementation
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3. Comprehensive testing
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See the "In Progress" and "Not Yet Implemented" sections above for contribution opportunities.
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